爆破振动对隧道不同级别围岩松动范围影响分析  

Analysis of the Influence of Blasting Vibration on the Loose Range of Surrounding Rocks with Different Grades in a Road Tunnel

作　　者：桑运龙 何国华[3] 孙州 刘学增 丁爽[1,4] SANG Yunlong;HE Guohua;SUN Zhou;LIU Xuezeng;DING Shuang(Shanghai Tongyan Civil Engineering Technology Co Ltd.,Shanghai 200092;Civil Engineering Research Center for Information Technology of Ministiy of Education,Tongji University,Shanghai 200092;Guizhou Expressway Group Co Ltd,,Guizhou 550001;Shanghai Engineering Research Center of Underground Infrasttructure Detection and Maintenance Equipment,Shanghai 200092)

机构地区：[1]上海同岩土木工程科技股份有限公司,上海200092 [2]同济大学土木信息技术教育部工程研究中心,上海200092 [3]贵州高速公路集团有限公司,贵州550001 [4]上海地下基础设施安全检测与养护装备工程技术研究中心,上海200092

出　　处：《现代隧道技术》2019年第S02期291-298,共8页Modern Tunnelling Technology

基　　金：贵州省科学技术厅项目重大科技专项经费资助(黔科合重大专项字[2018]3011);深圳市交通公用设施建设中心交通建设工程课题(20160318002 B);上海人才发展基金资助项目(2017055);贵州省交通运输厅科技项目(2014122022)

摘　　要：文章依托某双车道公路隧道工程,采用现场测试手段获取不同级别围岩区段的节理发育特征及开挖爆破参数,通过爆破荷载分析得到洞壁的爆破振动应力波,将其施加于考虑节理特征的隧道离散元计算模型上,分析爆破振动效应下围岩应力分布特性和松动范围。研究结果表明:(1)对于V级围岩区段,考虑爆破振动后,隧道不同部位松动圈高度增加了15%~45%,松动圈范围增加了34%;(2)Ⅲ级、Ⅳ级、V级围岩动力、静力计算松动圈面积比值分别为1.17,1.34和1.5,呈线性增长。Taking a two-lane highway tunnel as an example,the in-situ testing of surrounding rocks with different grades were performed to obtain joint features and excavation blasting parameters,the stress wave of blasting vibration was obtained by blasting load analysis.And then it was applied to a discrete element calculation model considering joints,to analyze the characteristics of stress distribution and loose zone of surrounding rocks under blasting vibration effect.The results show that:1)for V-grade surrounding rock,after considering blasting vibration,the height of loose zone in different parts of the tunnel increases by 15%~45%,and the range of loose zone increases by 34%;2)the dynamic and static calculated area ratios of gradeⅢ,ⅣandⅤsurrounding rocks are1.17,1.34,and 1.5,respectively,showing a linear increasing trend.

关 键 词：公路隧道 节理 松动圈 爆破振动 隧道支护 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]